Improvements
- Change the code of Challenge to 468 to avoid being cached by CDN
- Reduce the probability of deadlock in luigi
Fix
- Mistakenly return 504 error when 502 Bad Gateway
- Access log and error log in site detail do not refresh automatically
- Advanced statistics sometimes have data of 0
- Sites Serving as Static Files mistakenly record some rate-limiting logs caused by 127.0.0.1